The time of the ghost

The ghost turns up one summer day, alone in a world she once knew, among people who were once her family.

She knows she is one of four sisters, but which one?

She can be sure of only one thing - that there's been an accident.

As she struggles to find her identity, she becomes aware of a malevolent force stirring around her.

Something terrible is about to happen. One of the sisters will die - unless the ghost can use the future to reshape the past.

But how can she warn them, when they don't even know she exists?